Question

I have created some 4 to 5 Java files. They work well when I run using Netbeans or Eclipse, but when I try to run using command prompt I get some errors.

• I have put all my files in jdk/bin folder.
• I am using MySQL connector jar file – I have put that file in jdk/bin folder
• I have set my class path to jdk/bin folder

But I get errors like:

java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
    at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:169)
    at Dbconnection.Dbconnect(Dbconnection.java:29)
    at fileoperation.parsefiles(fileoperation.java:63)
    at fileoperation.main(fileoperation.java:127)

Will anybody tell – where is the problem?

Answer 1

First of all try running java and javac from command propmt, if they run properly its fine.
than Try this:

javac -cp /path to/your/mysql connector jar file/  MyProgram.java
java -cp  .;/path to/your/mysql connector jar file/ MyProgram

cp stands for classpath

You can also add multiple jar files after -cp.

if they don’t run i mean java or javac not found error comes up than add java.exe and javac.exe to your windows environment variable

Add C:\jdk1.6.0_23\bin which contains java.exe and javac.exe to your environment variable.